Add BloomFilterTest.

Change-Id: If97b9e9cc3bbaa4c7877991c11d7935626268ca3

native/jni/NativeFileList.mk

@@ -102,4 +102,5 @@ LATIN_IME_CORE_SRC_FILES := \
 LATIN_IME_CORE_TEST_FILES := \
     defines_test.cpp \
     suggest/core/layout/normal_distribution_2d_test.cpp \
+    suggest/core/dictionary/bloom_filter_test.cpp \
     utils/autocorrection_threshold_utils_test.cpp

native/jni/tests/suggest/core/dictionary/bloom_filter_test.cpp

+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/core/dictionary/bloom_filter.h"
+
+#include <gtest/gtest.h>
+
+#include <cstdlib>
+#include <ctime>
+#include <unordered_set>
+#include <vector>
+
+namespace latinime {
+namespace {
+
+TEST(BloomFilterTest, TestFilter) {
+    static const int ELEMENT_COUNT = 1000;
+    srand(time(0));
+    std::vector<int> elements;
+    std::unordered_set<int> elementsThatHaveBeenSetInFilter;
+    for (int i = 0; i < ELEMENT_COUNT; ++i) {
+        elements.push_back(rand());
+    }
+    BloomFilter bloomFilter;
+    for (const int elem : elements) {
+        ASSERT_FALSE(bloomFilter.isInFilter(elem));
+    }
+    for (const int elem : elements) {
+        if (rand() % 2 == 0) {
+            bloomFilter.setInFilter(elem);
+            elementsThatHaveBeenSetInFilter.insert(elem);
+        }
+    }
+    for (const int elem : elements) {
+        const bool existsInFilter = bloomFilter.isInFilter(elem);
+        const bool hasBeenSetInFilter =
+                elementsThatHaveBeenSetInFilter.find(elem) != elementsThatHaveBeenSetInFilter.end();
+        if (hasBeenSetInFilter) {
+            ASSERT_TRUE(existsInFilter);
+        }
+        if (!existsInFilter) {
+            ASSERT_FALSE(hasBeenSetInFilter);
+        }
+    }
+}
+
+}  // namespace
+}  // namespace latinime